我有一个Firebase数据库函数的问题。该documentation contains the following minimal example与交易数据的工作:Firebase类型错误:ref.transaction不是函数
var upvotesRef = db.ref("server/saving-data/fireblog/posts/-JRHTHaIs-jNPLXOQivY/upvotes");
upvotesRef.transaction(function (current_value) {
return (current_value || 0) + 1;
});
现在,我的火力点的数据库结构如下所示
/game-results
/RaUALJvTZVea5y6h1lzqGJPMpuI3
/distance
/score
/timestamp
/3ItAqKHL0XRUOum2Ajdz9hHQxMs1
/distance
/score
/timestamp
/statistics
/total-distance
/total-score
而且我想分数和距离总结到总。我使用下面的函数,这里total-distance
:
const functions = require('firebase-functions');
exports.updateTotalDistance = functions.database.ref('/game-results/{userId}/distance')
.onWrite(event => {
const newDistance = event.data.val();
const distanceRef = functions.database.ref('/statistics/total-distance')
return distanceRef.transaction(function(currentDistance) {
console.log('currentDistance', currentDistance);
return (currentDistance || 0) + newDistance;
});
});
不过,我不能换我周围为什么我得到的火力功能记录以下错误头:
TypeError: distanceRef.transaction is not a function
at exports.updateTotalDistance.functions.database.ref.onWrite.event (/user_code/index.js:19:22)
at /user_code/node_modules/firebase-functions/lib/cloud-functions.js:35:20
at process._tickDomainCallback (internal/process/next_tick.js:129:7)
为什么数据库引用不允许我写交易数据?我想要做的就是总结所有的分数和距离。